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Dissertations / Theses on the topic 'Natural fresh water'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kling, Lara Gates. "Habitat Utilization and Trophic Interactions by Fauna in a Shallow Estuary: Comparisons between Clam Aquaculture and Natural Sites." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539617925.

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Aquaculture of the hard clam, Mercenaria mercenaria, has steadily increased in the United States over the past 25 years. In some areas, including along Virginia’s coast, this industry has grown to such a scale that aquaculture systems now exist as agroecosystems within coastal waters. Several features of these aquaculture systems, such as high clam densities and protective mesh netting, may modify the availability of habitat, food, and nutrients and may be expected to affect benthic and nektonic community structure. Few studies, however, have evaluated these effects. We conducted seasonal (May

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2

Brooke, Sandra Dawn. "A Comparison of Natural and Laboratory Diets for the Culture of Marine Invertebrate Larvae American Oyster, Crassostrea virginica, Queen Conch, Strombus gigas, and Milk Conch, Strombus costatus." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539617706.

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3

Upton, Sally A. "Novel use of a Natural Isotope Signature to Track Recruitment and Evaluate Age Determination Methods for the 2002 Year Class of American Shad in the York River." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539617876.

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4

Blake, Sandra Grace. "Mitochondrial DNA Variation in Natural and Cultured Populations of the Bay Scallop, Argopecten irradians (Lamarck) and the Calico Scallop, Argopecten gibbus (Dall)." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539617667.

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5

Hewitt, David A. "Natural mortality of blue crab : estimation and influence on population dynamics /." W&M ScholarWorks, 2008. http://www.vims.edu/library/Theses/Hewitt08.pdf.

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6

Tillotson, Kathryn Helen. "Campaigns, perceptions, and consumption| A mixed methods study of fresh water management in the inland Northwest." Thesis, Washington State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3717503.

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<p> Dwindling freshwater resources are one of the largest challenges facing countries worldwide. For regional and local governments the task of managing fresh water resources falls the hardest. Reduced water quantity directly impacts water quality and thus preventing further depletion of freshwater levels is necessary for meeting existing and forth coming water quality regulations. Thus, finding effective ways to better understand water use at the local or regional level and better ways of communicating pressing water management issues with water users is imperative to the longevity of freshwa

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7

Rook, Megan Ann. "Mortality of Diamondback Terrapins in Blue Crab Traps: Population Changes and Conservation in Southeastern Virginia." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539626881.

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8

Freedman, Matthew Ryan. "Distribution and Impacts of Invasive Bivalve Corbicula fluminea in Tidal Freshwater York River Tributaries." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539617940.

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The Asian clam, Corbicula fluminea, is one of the most invasive bivalves in the world but there is limited research on its presence in tidal freshwater systems. Despite its introduction into Chesapeake Bay tributaries in the 1970s, the initial colonization and subsequent development of populations of C. fluminea in the Mattaponi and Pamunkey sub-tributaries of the York River, Virginia, is mostly undocumented. This study assessed the spatial distribution and population structure of C. fluminea in tidal freshwater sections of these rivers (~45km) with benthic surveys during summer 2011 – 2012. B

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9

Stickler, Shawn Michael. "Natural dermo resistance and related defense mechanisms in eastern oysters, Crassostrea virginica, with implications for restoration." W&M ScholarWorks, 2004. https://scholarworks.wm.edu/etd/1539616864.

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American oyster (Crassostrea virginica) stocks on the East Coast in general, and in Chesapeake Bay in particular, have been in decline over the past half-century in large part due to Dermo disease, caused by the protist parasite Perkinsus marinus. Efforts to restore oysters for their ecological and economic value have centered on the development and use of hatchery-based seed selectively bred for disease resistance. Selective breeding could benefit from the incorporation of oysters from wild stocks that have developed "natural Dermo resistance", but few such stocks have been identified and ver

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10

Marshall, Livingston Sinclair Jr. "Survival of juvenile queen conch, Strombus gigas, in natural habitats: Impact of prey, predator and habitat features." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539616765.

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In this dissertation, I experimentally examine predation-induced mortality upon juvenile queen conch, Strombus gigas, and assess the importance of select habitat predator and conch characteristics affecting predation intensity. Experiments were conducted during the summer and early fall of 1987, 1988, 1990 and 1991 in seagrass beds and adjacent sand flats near Lee Stocking Island, Exuma Cays, Bahamas. These experiments indicate that various factors act interactively to produce habitat-specific mortality rates in queen conch due to predation. These include (1) habitat type, whereby seagrass bed

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11

Kerstetter, David. "Use of Pop-Up Satellite Tag Technology to Estimate Survival of Blue Marlin (Makaira nigricans) Released from Pelagic Longline Gear." W&M ScholarWorks, 2001. https://scholarworks.wm.edu/etd/1539617772.

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12

Mothershead, Robert F. "Contaminant Accumulation in Hard and Soft Shell Blue Crabs from an Urban Subestuary." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539617623.

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Muscle and hepatopancreas of blue crabs (Callinectes sapidus), collected from the Elizabeth River, Virginia, contained residues of polycyclic aromatic hydrocarbon (PAHs}, polychlorinated biphenyls (PCBs) and organochlorine pesticides. Analytical procedures involved dichloromethane extraction of lyophilized tissue, followed by molecular size and polarity-based purification of the extract. capillary gas chromatography with flame ionization detection and electrolytic conductivity detection was used for quantitation and tentative identification of the xenobiotic compounds. Mass spectrometry was us

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13

Linebaugh, Donald W. "Carbon cycling in the York River Estuary: an isotopic and mass balance approach using natural Carbon-14 and Carbon-18 isotopes." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539791832.

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14

Scott, Tara L. "Accounting for undesirable outputs in productivity measurements: Application to the California-Oregon drift gillnet fishery." W&M ScholarWorks, 2010. https://scholarworks.wm.edu/etd/1539616845.

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Many production activities typically produce undesirable outputs, e.g., the production of the pollutant sulfur dioxide in the generation of electricity. Traditional economic metrics may overstate the efficiency and productivity of these production activities by failing to account for the undesirable outputs. These omissions can lead to conclusions that are biased against resource conservation and protection. Many fisheries capture their target species concomitantly with undesirable outputs such as bycatch of juvenile fish, marine mammals, sea birds, and sea turtles. One such fishery is the Cal

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15

Russell, Jr Scot Allan. "Analysis of Fresh Water Resources at the Line Hole Well Field, San Salvador Island, the Bahamas." TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/164.

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A major economic constraint in the Bahamas, and other small carbonates islands world-wide, is the lack of fresh water resources. To combat these socio-economic problems on San Salvador Island I sought to gain a more detailed understanding of the extent, behavior, and controls on the island’s fresh-water lens. DC electrical resistivity tomography and time-series geochemical data are used to study the fresh water lens at the Line Hole well field. Electrical Resistivity profiles are used to image the extent of fresh water resources. Time-series geochemical data provide information on the beha

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16

Li, Tong. "Lipid Class Composition of Oysters, Crassostrea virginica, Exposed to Sediment-Associated PAHs." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539617705.

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17

Brown, Gwynne D. "Intentional Introductions of Non-Indigenous Species: A Case Study of Policy and Management Affecting Crassostrea gigas." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539617643.

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18

Strickler, Matthew J. "Assessing the Impacts of Land use Change on Hard Clam Aquaculture in Old Plantation Creek, Northampton County, Virginia." W&M ScholarWorks, 2007. http://www.vims.edu/library/Theses/Strickler07.pdf.

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19

Henderson, Mark J. "Movements, Growth, and Mortality of Chesapeake Bay Summer Flounder Based on Multiple Tagging Technologies." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539616692.

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The research projects presented in this dissertation used multiple tagging technologies to examine the movements, growth, and mortality rates of summer flounder tagged and released in Chesapeake Bay. In the first two chapters, I used acoustic, archival, and conventional tags to examine the behavior of summer flounder on different spatial scales. Investigating the movement behavior of individuals on different scales is an important step towards understanding how large-scale distributions of a population are established. Based on the observed behaviors of summer flounder, I hypothesize that the

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20

Bankey, Laura Anne. "Responses of Cytochrome P450IA in Freshwater Fish Exposed to Pulp Mill Effluents in Experimental Stream Channels." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539617660.

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21

Ståhlberg, Carina. "Mineralisation rates of natural organic matter in surface sediments affected by physical forces : a study of fresh- and brackish-water sediments subjected to changed redox conditions, resuspension, and advective pore water flow /." Linköping : Department of Water and Environmental Studies, [The Tema Institute], Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8332.

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22

Mézin, Laurent C. "The Effects of Contaminated Sediment on the Epidermal Goblet Cells of the Mummichog, Fundulus heteroclitus." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539617665.

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Secretion of mucus by epidermal goblet cells is an important first line of defense for teleosts. It protects them against many of the biological, physical and chemical insults they encounter in their environment. This project monitored changes in hemoglobin concentration in epidermal mucus and in the density, diameter and mucus quality of epidermal goblet cells in the mummichog, Fundulus heteroclitus, following exposure to creosote-contaminated sediment. Male fish (200) were exposed for 13 days in flowthough aquaria to either an uncontaminated reference sediment or contaminated sediment contai

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23

Mirabilio, Sara. "Vitellogenin -- a Biomarker of Exposure to Environmental Estrogens for Mummichog (Fundulus heteroclitus) from a Creosote-Contaminated Site?" W&M ScholarWorks, 2001. https://scholarworks.wm.edu/etd/1539617770.

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Vitellogenin (VTG) is widely used as a biomarker for environmental estrogens and reproductive disruption in fish. Vitellogenesis is the process by which yolk is formed. The endpoint is most sensitive in male fish where vitellogenesis is an abnormal process. Research examining effects of environmental mixtures of chemicals (e.g. creosote) on vitellogenesis is limited. This study examines plasma VTG expression in both male and female mummichog, Fundulus heteroclitus, collected from a creosote-contaminated site and two reference sites in lower Chesapeake Bay, USA, and in wild-caught male referenc

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24

Lawless, Amanda Sue. "Effects of Shoreline Development and Oyster Reefs on Benthic Communities in Lynnhaven, Virginia." W&M ScholarWorks, 2008. http://web.vims.edu/library/Theses/Lawless08.pdf.

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25

Doliber, Sarah Rebecca. "Groundwater Surface Trends in the North Florence Dunal Aquifer, Oregon Coast, USA." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/530.

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The North Florence Dunal Aquifer is the only feasible source for drinking water for the coastal city of Florence, Oregon and Florence's Urban Growth Boundary. High infiltration rates and a shallow groundwater table leave the aquifer highly susceptible to contamination from septic tank effluent, storm runoff, chemical fertilizers and recreational ATV use throughout the dunes. Public interest in the quality and quantity of the aquifer water has been sparked since the City of Florence received a grant from the Environmental Protection Agency for a watershed protection and restoration project. Del

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26

Georges, Valentin. "Comportement de matériaux cimentaires en eau douce naturelle : analyse de l’influence des micro-organismes." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0220/document.

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Ces travaux s’intéressent au comportement de pâtes de ciment de différentes natures cimentaires exposées à une eau douce naturelle et plus particulièrement aux interactions avec les éléments biologiques. Cette étude est basée sur l’analyse comparative d’échantillons placés en milieu naturel (Moselle) et en milieux artificiels de laboratoire. Quels que soient les milieux et les microorganismes considérés, les résultats montrent une modification de la minéralogie de la surface et du réseau poreux des échantillons (taux de porosité, propriétés de transferts). Les essais en laboratoire ont permis

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27

Hinkle, Jameson. "PROOF-OF-CONCEPT OF ENVIRONMENTAL DNA TOOLS FOR ATLANTIC STURGEON MANAGEMENT." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3932.

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Abstract The Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus, Mitchell) is an anadromous species that spawns in tidal freshwater rivers from Canada to Florida. Overfishing, river sedimentation and alteration of the river bottom have decreased Atlantic Sturgeon populations, and NOAA lists the species as endangered. Ecologists sometimes find it difficult to locate individuals of a species that is rare, endangered or invasive. The need for methods less invasive that can create more resolution of cryptic species presence is necessary. Environmental DNA (eDNA) is a non-invasive means of detectin

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28

Kim, Ji Yeon. "The role of naturally occurring waterholes in determining the distribution of Florida Key Deer." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2845.

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29

Mendon?a, Juska Milena dos Santos. "Avalia??o da toxicidade de flora??es naturais e de cultura de cianobact?rias: efeitos sobre Ceriodaphnia silvestri (Crustacea, Cladocera)." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12502.

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Made available in DSpace on 2014-12-17T14:02:02Z (GMT). No. of bitstreams: 1 JuskaMSM.pdf: 940466 bytes, checksum: 95c63af4ea67b2fb9341e2034e0242a4 (MD5) Previous issue date: 2006-07-30<br>The incidence of toxic cyanobacterial blooms is one of the important consequences of eutrophication in aquatic ecosystems. It is a very common phenomenon in reservoirs and shrimp ponds in the State of Rio Grande do Norte (RN), Brazil. Cyanobacterias produce toxins which can affect aquatic organisms and men trough the food chain. Aiming to contribute to the studies of cyanobacterias in RN, we propose: a) to

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30

Pham, An Ninh Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Kinetics and mechanism of various iron transformations in natural waters at circumneutral pH." 2007. http://handle.unsw.edu.au/1959.4/40649.

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In this thesis, the implementation and results of studies into the effect of pH on the kinetics of various iron transformations in natural waters are described. Specific studies include i) the oxidation of Fe(II) in the absence and presence of both model and natural organic ligands, ii) the complexation of Fe(III) by model organic compounds, and iii) the precipitation of Fe(III) through the use of both laboratory investigations of iron species and kinetic modeling. In the absence of organic ligands, oxidation of nanomolar concentrations of Fe(II) over the pH range 6.0 -- 8.0 is predominantl

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31

Axthelm, Charlotte. "Hydrologic Structure and Function of Vernal Pools in South Deerfield, Massachusetts." 2019. https://scholarworks.umass.edu/masters_theses_2/818.

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Vernal pools are small, ephemeral wetlands lacking an inlet or outlet. These wetlands, also known as seasonal pools, are found in a wide range of biomes, and their characteristics vary based on location. While the vegetation of western U.S. pools, and amphibians of eastern U.S. pools have been extensively studied, many aspects of vernal pools have not been fully characterized. In particular, although the general seasonal wetting and drying cycle is understood qualitatively, few studies have attempted to quantify the hydrological regime of vernal pools in New England. As water level variation d

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32

Devine, Matthew T. "Juvenile River Herring in Freshwater Lakes: Sampling Approaches for Evaluating Growth and Survival." 2017. https://scholarworks.umass.edu/masters_theses_2/574.

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River herring, collectively alewives (Alosa pseudoharengus) and blueback herring (A. aestivalis), have experienced substantial population declines over the past five decades due in large part to overfishing, combined with other sources of mortality, and disrupted access to critical freshwater spawning habitats. Anadromous river herring populations are currently assessed by counting adults in rivers during upstream spawning migrations, but no field-based assessment methods exist for estimating juvenile densities in freshwater nursery habitats. Counts of 4-year-old migrating adults are variable

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33

Candlish, Joseph Ross. "Aquatic Habitat Mapping within the Obed Wild and Scenic River for Threatened and Endangered Species Habitat Delineation." 2010. http://trace.tennessee.edu/utk_gradthes/608.

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There is a need to define a more efficient and accurate approach to aquatic habitat mapping. Traditional approaches have focused on intense biological/non-biological sampling and observation analysis within specific and restrained scales. Therefore, an underwater video mapping system (UVMS) has been developed in efforts to identify federally protected aquatic species’ habitats within the Obed Wild and Scenic River (OBRI). The UVMS kayak apparatus provides georeferenced video footage correlated with GPS (global positioning systems) for GIS (geographic information systems) mapping applications.

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34

Mattocks, Steven R. "Ecological Consequences of Lost Anadromous Forage Fish in Freshwater Ecosystems." 2016. https://scholarworks.umass.edu/masters_theses_2/433.

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Beginning in the early 1600s, dam construction in New England obstructed anadromous fish access to spawning grounds during migration. As a result, anadromous forage fish populations have declined, which has impacted freshwater, marine, and terrestrial ecosystems. To determine the impacts of dams on anadromous forage fish and freshwater ecosystems, I used historical and current data to estimate population changes in alewives (Alosa pseudoharengus) from 1600-1900. A significant reduction in spawning habitat occurred in New England as a result of 1,642 dams constructed between 1600 and 1900, resu

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35

XU, HUI-GIAN, and 徐慧倩. "The linear free energy relationship and its application in natural fresh waters." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/13197764645316621362.

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